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Histopathology from surgical specimen. (A) Illustrates normal renal parenchyma (bottom) with adjacent cyst wall (top) separated by fibroconnective tissue (middle). The top of the cyst wall consists of soft intestinal epithelium with an underlying muscular layer. Malignant transformation of the cyst wall into adenocarcinoma (B) is shown with neoplastic glands depicted on the bottom of the image. Transformation of normal intestinal to dysplastic epithelium can be seen in (C).
